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The better we get at technology, the fewer mysteries there are in the world. Which makes it all the more impressive that there are still a ton of mysteries that experts are still scratching their heads over.

And we're not talking about the run-of-the-mill "where are my car keys" type of mysteries. There are truly disturbing, cold-sweat-worthy mysteries that professionals are still shrugging over and tossing into their "hell if I know" files. Like...

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